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U.S. Geological Survey Open-File Report 03-221
A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts

 Detailed Bedrock Photographskip navbar


SAMPLE_ID:  95MW0107

DATE: 8/5/2002

Sample: 95MW0107 - Granite


Sample 95MW0107 is an unfoliated granite with a composition of K-feldspar (58%), quartz (20%), plagioclase (15%), muscovite (2%), biotite (1%), epidote (1%), oxides (1%), chlorite (1%), and trace sphene. K-feldspar occurs mainly as large (up to 8 mm), perthitic, tartan twinned porphyries with irregular grain boundaries. Quartz is found in the matrix and in ~3-mm aggregates. Plagioclase grains, generally smaller than K-feldspar porphyries, show albite twinning, seritization, and differential recrystallization. Biotite occurs in bundles, and it is extensively altered to chlorite and epidote. Microcrystalline sphene rims some oxide grains. 

Latitude: 41.639084

Longitude: -70.541595

Elevation of well site (m): 28.97

Elevation of the upper
bedrock surface (m):

Elevation of the
top of casing (m):

Total thickness of strata
penetrated by the well (m):

A Thin Section of this image is available.

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OFR03-221 Home | Introduction | Bedrock Photographs | GIS Data Catalog

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